gcc.h: re-add gcc_const and gcc_pure

Remove GLib dependency from some headers.

28 files changed, 123 insertions, 92 deletions

diff --git a/src/DatabasePlugin.hxx b/src/DatabasePlugin.hxx
index 45a8c55b..71ad88ac 100644
--- a/src/DatabasePlugin.hxx
+++ b/src/DatabasePlugin.hxx
@@ -27,10 +27,7 @@
 #define MPD_DATABASE_PLUGIN_HXX
 
 #include "DatabaseVisitor.hxx"
-
-#include <glib.h>
-#include <assert.h>
-#include <stdbool.h>
+#include "gcc.h"
 
 struct config_param;
 struct db_selection;
@@ -46,7 +43,7 @@ public:
 	/**
          * Open the database.  Read it into memory if applicable.
 	 */
-	virtual bool Open(G_GNUC_UNUSED GError **error_r) {
+	virtual bool Open(gcc_unused GError **error_r) {
 		return true;
 	}
 
diff --git a/src/audio_check.h b/src/audio_check.h
index 9f71cf9c..e2302126 100644
--- a/src/audio_check.h
+++ b/src/audio_check.h
@@ -28,7 +28,7 @@
 /**
  * The GLib quark used for errors reported by this library.
  */
-G_GNUC_CONST
+gcc_const
 static inline GQuark
 audio_format_quark(void)
 {
diff --git a/src/audio_format.h b/src/audio_format.h
index bf77add3..d86ade5e 100644
--- a/src/audio_format.h
+++ b/src/audio_format.h
@@ -20,7 +20,8 @@
 #ifndef MPD_AUDIO_FORMAT_H
 #define MPD_AUDIO_FORMAT_H
 
-#include <glib.h>
+#include "gcc.h"
+
 #include <stdint.h>
 #include <stdbool.h>
 #include <assert.h>
@@ -189,7 +190,7 @@ audio_valid_channel_count(unsigned channels)
  * Returns false if the format is not valid for playback with MPD.
  * This function performs some basic validity checks.
  */
-G_GNUC_PURE
+gcc_pure
 static inline bool audio_format_valid(const struct audio_format *af)
 {
 	return audio_valid_sample_rate(af->sample_rate) &&
@@ -201,7 +202,7 @@ static inline bool audio_format_valid(const struct audio_format *af)
  * Returns false if the format mask is not valid for playback with
  * MPD.  This function performs some basic validity checks.
  */
-G_GNUC_PURE
+gcc_pure
 static inline bool audio_format_mask_valid(const struct audio_format *af)
 {
 	return (af->sample_rate == 0 ||
@@ -223,7 +224,7 @@ void
 audio_format_mask_apply(struct audio_format *af,
 			const struct audio_format *mask);
 
-G_GNUC_CONST
+gcc_const
 static inline unsigned
 sample_format_size(enum sample_format format)
 {
@@ -254,7 +255,7 @@ sample_format_size(enum sample_format format)
 /**
  * Returns the size of each (mono) sample in bytes.
  */
-G_GNUC_PURE
+gcc_pure
 static inline unsigned audio_format_sample_size(const struct audio_format *af)
 {
 	return sample_format_size((enum sample_format)af->format);
@@ -263,7 +264,7 @@ static inline unsigned audio_format_sample_size(const struct audio_format *af)
 /**
  * Returns the size of each full frame in bytes.
  */
-G_GNUC_PURE
+gcc_pure
 static inline unsigned
 audio_format_frame_size(const struct audio_format *af)
 {
@@ -274,7 +275,7 @@ audio_format_frame_size(const struct audio_format *af)
  * Returns the floating point factor which converts a time span to a
  * storage size in bytes.
  */
-G_GNUC_PURE
+gcc_pure
 static inline double audio_format_time_to_size(const struct audio_format *af)
 {
 	return af->sample_rate * audio_format_frame_size(af);
@@ -287,7 +288,7 @@ static inline double audio_format_time_to_size(const struct audio_format *af)
  * @param format a #sample_format enum value
  * @return the string
  */
-G_GNUC_PURE G_GNUC_MALLOC
+gcc_pure gcc_malloc
 const char *
 sample_format_to_string(enum sample_format format);
 
@@ -299,7 +300,7 @@ sample_format_to_string(enum sample_format format);
  * @param s a buffer to print into
  * @return the string, or NULL if the #audio_format object is invalid
  */
-G_GNUC_PURE G_GNUC_MALLOC
+gcc_pure gcc_malloc
 const char *
 audio_format_to_string(const struct audio_format *af,
 		       struct audio_format_string *s);
diff --git a/src/client.h b/src/client.h
index 0302a2e0..51ad1eb2 100644
--- a/src/client.h
+++ b/src/client.h
@@ -20,7 +20,8 @@
 #ifndef MPD_CLIENT_H
 #define MPD_CLIENT_H
 
-#include <glib.h>
+#include "gcc.h"
+
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdarg.h>
@@ -35,28 +36,28 @@ void client_manager_deinit(void);
 void client_new(struct player_control *player_control,
 		int fd, const struct sockaddr *sa, size_t sa_length, int uid);
 
-G_GNUC_PURE
+gcc_pure
 bool client_is_expired(const struct client *client);
 
 /**
  * returns the uid of the client process, or a negative value if the
  * uid is unknown
  */
-G_GNUC_PURE
+gcc_pure
 int client_get_uid(const struct client *client);
 
 /**
  * Is this client running on the same machine, connected with a local
  * (UNIX domain) socket?
  */
-G_GNUC_PURE
+gcc_pure
 static inline bool
 client_is_local(const struct client *client)
 {
 	return client_get_uid(client) > 0;
 }
 
-G_GNUC_PURE
+gcc_pure
 unsigned client_get_permission(const struct client *client);
 
 void client_set_permission(struct client *client, unsigned permission);
@@ -74,6 +75,8 @@ void client_vprintf(struct client *client, const char *fmt, va_list args);
 /**
  * Write a printf-like formatted string to the client.
  */
-G_GNUC_PRINTF(2, 3) void client_printf(struct client *client, const char *fmt, ...);
+gcc_fprintf
+void
+client_printf(struct client *client, const char *fmt, ...);
 
 #endif
diff --git a/src/client_file.h b/src/client_file.h
index 3dcbe750..43923573 100644
--- a/src/client_file.h
+++ b/src/client_file.h
@@ -20,7 +20,9 @@
 #ifndef MPD_CLIENT_FILE_H
 #define MPD_CLIENT_FILE_H
 
-#include <glib.h>
+#include "gcc.h"
+#include "gerror.h"
+
 #include <stdbool.h>
 
 struct client;
@@ -35,7 +37,7 @@ struct client;
  * @param path_fs the absolute path name in filesystem encoding
  * @return true if access is allowed
  */
-G_GNUC_PURE
+gcc_pure
 bool
 client_allow_file(const struct client *client, const char *path_fs,
 		  GError **error_r);
diff --git a/src/client_message.h b/src/client_message.h
index 38c2e761..6d1e734b 100644
--- a/src/client_message.h
+++ b/src/client_message.h
@@ -20,10 +20,11 @@
 #ifndef MPD_CLIENT_MESSAGE_H
 #define MPD_CLIENT_MESSAGE_H
 
+#include "gcc.h"
+
 #include <assert.h>
 #include <stdbool.h>
 #include <stddef.h>
-#include <glib.h>
 
 /**
  * A client-to-client message.
@@ -34,11 +35,11 @@ struct client_message {
 	char *message;
 };
 
-G_GNUC_PURE
+gcc_pure
 bool
 client_message_valid_channel_name(const char *name);
 
-G_GNUC_PURE
+gcc_pure
 static inline bool
 client_message_defined(const struct client_message *msg)
 {
@@ -59,7 +60,7 @@ void
 client_message_copy(struct client_message *dest,
 		    const struct client_message *src);
 
-G_GNUC_MALLOC
+gcc_malloc
 struct client_message *
 client_message_dup(const struct client_message *src);
 
diff --git a/src/client_subscribe.h b/src/client_subscribe.h
index 09f86441..2dff982b 100644
--- a/src/client_subscribe.h
+++ b/src/client_subscribe.h
@@ -20,9 +20,11 @@
 #ifndef MPD_CLIENT_SUBSCRIBE_H
 #define MPD_CLIENT_SUBSCRIBE_H
 
+#include "gcc.h"
+
 #include <stdbool.h>
-#include <glib.h>
 
+typedef struct _GSList GSList;
 struct client;
 struct client_message;
 
@@ -52,7 +54,7 @@ client_unsubscribe_all(struct client *client);
 bool
 client_push_message(struct client *client, const struct client_message *msg);
 
-G_GNUC_MALLOC
+gcc_malloc
 GSList *
 client_read_messages(struct client *client);
 
diff --git a/src/command.h b/src/command.h
index 68d1f95e..e2e0cbe8 100644
--- a/src/command.h
+++ b/src/command.h
@@ -22,7 +22,6 @@
 
 #include "ack.h"
 
-#include <glib.h>
 #include <stdbool.h>
 
 enum command_return {
diff --git a/src/database.h b/src/database.h
index f877b74d..47d52da6 100644
--- a/src/database.h
+++ b/src/database.h
@@ -47,7 +47,7 @@ db_finish(void);
  * Returns the root directory object.  Returns NULL if there is no
  * configured music directory.
  */
-G_GNUC_PURE
+gcc_pure
 struct directory *
 db_get_root(void);
 
@@ -55,12 +55,12 @@ db_get_root(void);
  * Caller must lock the #db_mutex.
  */
 gcc_nonnull(1)
-G_GNUC_PURE
+gcc_pure
 struct directory *
 db_get_directory(const char *name);
 
 gcc_nonnull(1)
-G_GNUC_PURE
+gcc_pure
 struct song *
 db_get_song(const char *file);
 
@@ -82,14 +82,14 @@ db_save(GError **error_r);
 bool
 db_load(GError **error);
 
-G_GNUC_PURE
+gcc_pure
 time_t
 db_get_mtime(void);
 
 /**
  * Returns true if there is a valid database file on the disk.
  */
-G_GNUC_PURE
+gcc_pure
 static inline bool
 db_exists(void)
 {
diff --git a/src/db/SimpleDatabasePlugin.hxx b/src/db/SimpleDatabasePlugin.hxx
index e2d24738..6582118d 100644
--- a/src/db/SimpleDatabasePlugin.hxx
+++ b/src/db/SimpleDatabasePlugin.hxx
@@ -26,7 +26,6 @@
 #include <cassert>
 #include <string>
 
-#include <glib.h>
 #include <stdbool.h>
 #include <time.h>
 
@@ -40,7 +39,7 @@ class SimpleDatabase : public Database {
 	time_t mtime;
 
 public:
-	G_GNUC_PURE
+	gcc_pure
 	struct directory *GetRoot() {
 		assert(root != NULL);
 
@@ -49,7 +48,7 @@ public:
 
 	bool Save(GError **error_r);
 
-	G_GNUC_PURE
+	gcc_pure
 	time_t GetLastModified() const {
 		return mtime;
 	}
@@ -70,12 +69,12 @@ public:
 protected:
 	bool Configure(const struct config_param *param, GError **error_r);
 
-	G_GNUC_PURE
+	gcc_pure
 	bool Check(GError **error_r) const;
 
 	bool Load(GError **error_r);
 
-	G_GNUC_PURE
+	gcc_pure
 	const struct directory *LookupDirectory(const char *uri) const;
 };
 
diff --git a/src/decoder/_flac_common.h b/src/decoder/_flac_common.h
index 0d90ba65..c898a47c 100644
--- a/src/decoder/_flac_common.h
+++ b/src/decoder/_flac_common.h
@@ -27,8 +27,6 @@
 #include "decoder_api.h"
 #include "pcm_buffer.h"
 
-#include <glib.h>
-
 #include <FLAC/stream_decoder.h>
 #include <FLAC/metadata.h>
 
diff --git a/src/gcc.h b/src/gcc.h
index 1d0128cb..22b712af 100644
--- a/src/gcc.h
+++ b/src/gcc.h
@@ -32,6 +32,9 @@
  */
 
 #if GCC_CHECK_VERSION(3,0)
+#  define gcc_const __attribute__((const))
+#  define gcc_pure __attribute__((pure))
+#  define gcc_malloc __attribute__((malloc))
 #  define gcc_must_check	__attribute__ ((warn_unused_result))
 #  define gcc_packed		__attribute__ ((packed))
 /* these are very useful for type checking */
@@ -41,11 +44,21 @@
 #  define gcc_fprintf__		__attribute__ ((format(printf,4,5)))
 #  define gcc_scanf		__attribute__ ((format(scanf,1,2)))
 #  define gcc_used		__attribute__ ((used))
+#  define gcc_unused __attribute__((unused))
+#  define gcc_warn_unused_result __attribute__((warn_unused_result))
 /* #  define inline	inline __attribute__ ((always_inline)) */
 #  define gcc_noinline		__attribute__ ((noinline))
 #  define gcc_nonnull(...) __attribute__((nonnull(__VA_ARGS__)))
 #  define gcc_nonnull_all __attribute__((nonnull))
+
+#  define gcc_likely(x) __builtin_expect (!!(x), 1)
+#  define gcc_unlikely(x) __builtin_expect (!!(x), 0)
+
 #else
+#  define gcc_unused
+#  define gcc_const
+#  define gcc_pure
+#  define gcc_malloc
 #  define gcc_must_check
 #  define gcc_packed
 #  define gcc_printf
@@ -54,10 +67,16 @@
 #  define gcc_fprintf__
 #  define gcc_scanf
 #  define gcc_used
+#  define gcc_unused
+#  define gcc_warn_unused_result
 /* #  define inline */
 #  define gcc_noinline
 #  define gcc_nonnull(...)
 #  define gcc_nonnull_all
+
+#  define gcc_likely(x) (x)
+#  define gcc_unlikely(x) (x)
+
 #endif
 
 #ifdef __cplusplus
diff --git a/src/ls.c b/src/ls.c
index 310c2d7b..90e5fc66 100644
--- a/src/ls.c
+++ b/src/ls.c
@@ -22,6 +22,8 @@
 #include "uri.h"
 #include "client.h"
 
+#include <glib.h>
+
 #include <assert.h>
 #include <string.h>
 
diff --git a/src/mapper.h b/src/mapper.h
index da2bf3da..f57e3c9a 100644
--- a/src/mapper.h
+++ b/src/mapper.h
@@ -24,10 +24,11 @@
 #ifndef MPD_MAPPER_H
 #define MPD_MAPPER_H
 
+#include "gcc.h"
 #include "gerror.h"
 
-#include <glib.h>
 #include <stdbool.h>
+#include <stddef.h>
 
 #define PLAYLIST_FILE_SUFFIX ".m3u"
 
@@ -38,14 +39,14 @@ void mapper_init(const char *_music_dir, const char *_playlist_dir);
 
 void mapper_finish(void);
 
-G_GNUC_CONST
+gcc_const
 const char *
 mapper_get_music_directory(void);
 
 /**
  * Returns true if a music directory was configured.
  */
-G_GNUC_CONST
+gcc_const
 static inline bool
 mapper_has_music_directory(void)
 {
@@ -57,7 +58,7 @@ mapper_has_music_directory(void)
  * this function converts it to a relative path.  If not, it returns
  * the unmodified string pointer.
  */
-G_GNUC_PURE
+gcc_pure
 const char *
 map_to_relative_path(const char *path_utf8);
 
@@ -66,7 +67,7 @@ map_to_relative_path(const char *path_utf8);
  * is basically done by converting the URI to the file system charset
  * and prepending the music directory.
  */
-G_GNUC_MALLOC
+gcc_malloc
 char *
 map_uri_fs(const char *uri);
 
@@ -76,7 +77,7 @@ map_uri_fs(const char *uri);
  * @param directory the directory object
  * @return the path in file system encoding, or NULL if mapping failed
  */
-G_GNUC_MALLOC
+gcc_malloc
 char *
 map_directory_fs(const struct directory *directory);
 
@@ -88,7 +89,7 @@ map_directory_fs(const struct directory *directory);
  * @param name the child's name in UTF-8
  * @return the path in file system encoding, or NULL if mapping failed
  */
-G_GNUC_MALLOC
+gcc_malloc
 char *
 map_directory_child_fs(const struct directory *directory, const char *name);
 
@@ -99,7 +100,7 @@ map_directory_child_fs(const struct directory *directory, const char *name);
  * @param song the song object
  * @return the path in file system encoding, or NULL if mapping failed
  */
-G_GNUC_MALLOC
+gcc_malloc
 char *
 map_song_fs(const struct song *song);
 
@@ -110,14 +111,14 @@ map_song_fs(const struct song *song);
  * @param path_fs a path in file system encoding
  * @return the relative path in UTF-8, or NULL if mapping failed
  */
-G_GNUC_MALLOC
+gcc_malloc
 char *
 map_fs_to_utf8(const char *path_fs);
 
 /**
  * Returns the playlist directory.
  */
-G_GNUC_CONST
+gcc_const
 const char *
 map_spl_path(void);
 
@@ -128,7 +129,7 @@ map_spl_path(void);
  *
  * @return the path in file system encoding, or NULL if mapping failed
  */
-G_GNUC_PURE
+gcc_pure
 char *
 map_spl_utf8_to_fs(const char *name);
 
diff --git a/src/output/httpd_client.h b/src/output/httpd_client.h
index 739163f4..f0df829d 100644
--- a/src/output/httpd_client.h
+++ b/src/output/httpd_client.h
@@ -20,9 +20,8 @@
 #ifndef MPD_OUTPUT_HTTPD_CLIENT_H
 #define MPD_OUTPUT_HTTPD_CLIENT_H
 
-#include <glib.h>
-
 #include <stdbool.h>
+#include <stddef.h>
 
 struct httpd_client;
 struct httpd_output;
diff --git a/src/output_plugin.h b/src/output_plugin.h
index 7ac8e0c4..a4729656 100644
--- a/src/output_plugin.h
+++ b/src/output_plugin.h
@@ -20,10 +20,9 @@
 #ifndef MPD_OUTPUT_PLUGIN_H
 #define MPD_OUTPUT_PLUGIN_H
 
+#include "gcc.h"
 #include "gerror.h"
 
-#include <glib.h>
-
 #include <stdbool.h>
 #include <stddef.h>
 
@@ -167,7 +166,7 @@ ao_plugin_test_default_device(const struct audio_output_plugin *plugin)
 		: false;
 }
 
-G_GNUC_MALLOC
+gcc_malloc
 struct audio_output *
 ao_plugin_init(const struct audio_output_plugin *plugin,
 	       const struct config_param *param,
@@ -189,7 +188,7 @@ ao_plugin_open(struct audio_output *ao, struct audio_format *audio_format,
 void
 ao_plugin_close(struct audio_output *ao);
 
-G_GNUC_PURE
+gcc_pure
 unsigned
 ao_plugin_delay(struct audio_output *ao);
 
diff --git a/src/pcm_mix.h b/src/pcm_mix.h
index 0e58d01e..0cf55768 100644
--- a/src/pcm_mix.h
+++ b/src/pcm_mix.h
@@ -21,6 +21,7 @@
 #define PCM_MIX_H
 
 #include "audio_format.h"
+#include "gcc.h"
 
 #include <stdbool.h>
 #include <stddef.h>
@@ -41,7 +42,7 @@
  *
  * @return true on success, false if the format is not supported
  */
-G_GNUC_WARN_UNUSED_RESULT
+gcc_warn_unused_result
 bool
 pcm_mix(void *buffer1, const void *buffer2, size_t size,
 	enum sample_format format, float portion1);
diff --git a/src/pcm_volume.h b/src/pcm_volume.h
index 64e3c764..4a4a4e45 100644
--- a/src/pcm_volume.h
+++ b/src/pcm_volume.h
@@ -25,6 +25,7 @@
 
 #include <stdint.h>
 #include <stdbool.h>
+#include <stddef.h>
 
 enum {
 	/** this value means "100% volume" */
diff --git a/src/pipe.h b/src/pipe.h
index 84b9869e..6b5bbf0c 100644
--- a/src/pipe.h
+++ b/src/pipe.h
@@ -20,7 +20,8 @@
 #ifndef MPD_PIPE_H
 #define MPD_PIPE_H
 
-#include <glib.h>
+#include "gcc.h"
+
 #include <stdbool.h>
 
 #ifndef NDEBUG
@@ -39,7 +40,7 @@ struct music_pipe;
 /**
  * Creates a new #music_pipe object.  It is empty.
  */
-G_GNUC_MALLOC
+gcc_malloc
 struct music_pipe *
 music_pipe_new(void);
 
@@ -72,7 +73,7 @@ music_pipe_contains(const struct music_pipe *mp,
  * Returns the first #music_chunk from the pipe.  Returns NULL if the
  * pipe is empty.
  */
-G_GNUC_PURE
+gcc_pure
 const struct music_chunk *
 music_pipe_peek(const struct music_pipe *mp);
 
@@ -99,11 +100,11 @@ music_pipe_push(struct music_pipe *mp, struct music_chunk *chunk);
 /**
  * Returns the number of chunks currently in this pipe.
  */
-G_GNUC_PURE
+gcc_pure
 unsigned
 music_pipe_size(const struct music_pipe *mp);
 
-G_GNUC_PURE
+gcc_pure
 static inline bool
 music_pipe_empty(const struct music_pipe *mp)
 {
diff --git a/src/protocol/result.h b/src/protocol/result.h
index 8b9e44bf..09ea6c41 100644
--- a/src/protocol/result.h
+++ b/src/protocol/result.h
@@ -21,10 +21,9 @@
 #define MPD_PROTOCOL_RESULT_H
 
 #include "check.h"
+#include "gcc.h"
 #include "ack.h"
 
-#include <glib.h>
-
 struct client;
 
 extern const char *current_command;
@@ -37,7 +36,7 @@ void
 command_error_v(struct client *client, enum ack error,
 		const char *fmt, va_list args);
 
-G_GNUC_PRINTF(3, 4)
+gcc_fprintf_
 void
 command_error(struct client *client, enum ack error, const char *fmt, ...);
 
diff --git a/src/resolver.h b/src/resolver.h
index e5ad0675..666b6d5b 100644
--- a/src/resolver.h
+++ b/src/resolver.h
@@ -20,12 +20,14 @@
 #ifndef MPD_RESOLVER_H
 #define MPD_RESOLVER_H
 
+#include "gcc.h"
+
 #include <glib.h>
 
 struct sockaddr;
 struct addrinfo;
 
-G_GNUC_CONST
+gcc_const
 static inline GQuark
 resolver_quark(void)
 {
@@ -42,7 +44,7 @@ resolver_quark(void)
  * @param error location to store the error occurring, or NULL to
  * ignore errors
  */
-G_GNUC_MALLOC
+gcc_malloc
 char *
 sockaddr_to_string(const struct sockaddr *sa, size_t length, GError **error);
 
diff --git a/src/string_util.h b/src/string_util.h
index dc80a46e..683fada1 100644
--- a/src/string_util.h
+++ b/src/string_util.h
@@ -20,7 +20,7 @@
 #ifndef MPD_STRING_UTIL_H
 #define MPD_STRING_UTIL_H
 
-#include <glib.h>
+#include "gcc.h"
 
 #include <stdbool.h>
 
@@ -28,7 +28,7 @@
  * Remove the "const" attribute from a string pointer.  This is a
  * dirty hack, don't use it unless you know what you're doing!
  */
-G_GNUC_CONST
+gcc_const
 static inline char *
 deconst_string(const char *p)
 {
@@ -49,14 +49,14 @@ deconst_string(const char *p)
  * This is a faster version of g_strchug(), because it does not move
  * data.
  */
-G_GNUC_PURE
+gcc_pure
 const char *
 strchug_fast_c(const char *p);
 
 /**
  * Same as strchug_fast_c(), but works with a writable pointer.
  */
-G_GNUC_PURE
+gcc_pure
 static inline char *
 strchug_fast(char *p)
 {
diff --git a/src/strset.c b/src/strset.c
index 5862e407..f1a5197d 100644
--- a/src/strset.c
+++ b/src/strset.c
@@ -20,6 +20,8 @@
 #include "config.h"
 #include "strset.h"
 
+#include <glib.h>
+
 #include <assert.h>
 #include <string.h>
 #include <stdlib.h>
diff --git a/src/strset.h b/src/strset.h
index 5382e59b..6965a582 100644
--- a/src/strset.h
+++ b/src/strset.h
@@ -29,11 +29,13 @@
 #ifndef MPD_STRSET_H
 #define MPD_STRSET_H
 
-#include <glib.h>
+#include "gcc.h"
 
 struct strset;
 
-G_GNUC_MALLOC struct strset *strset_new(void);
+gcc_malloc
+struct strset *
+strset_new(void);
 
 void strset_free(struct strset *set);
 
diff --git a/src/tag_id3.h b/src/tag_id3.h
index 055d0a3d..473e3384 100644
--- a/src/tag_id3.h
+++ b/src/tag_id3.h
@@ -21,10 +21,9 @@
 #define MPD_TAG_ID3_H
 
 #include "check.h"
+#include "gcc.h"
 #include "gerror.h"
 
-#include <glib.h>
-
 #include <stdbool.h>
 
 struct tag_handler;
@@ -52,9 +51,9 @@ tag_id3_load(const char *path_fs, GError **error_r);
 #else
 
 static inline bool
-tag_id3_scan(G_GNUC_UNUSED const char *path_fs,
-	     G_GNUC_UNUSED const struct tag_handler *handler,
-	     G_GNUC_UNUSED void *handler_ctx)
+tag_id3_scan(gcc_unused const char *path_fs,
+	     gcc_unused const struct tag_handler *handler,
+	     gcc_unused void *handler_ctx)
 {
 	return false;
 }
diff --git a/src/update_archive.h b/src/update_archive.h
index 838697dd..a9139b0e 100644
--- a/src/update_archive.h
+++ b/src/update_archive.h
@@ -21,6 +21,7 @@
 #define MPD_UPDATE_ARCHIVE_H
 
 #include "check.h"
+#include "gcc.h"
 
 #include <stdbool.h>
 #include <sys/stat.h>
@@ -40,10 +41,10 @@ update_archive_file(struct directory *directory,
 #include <glib.h>
 
 static inline bool
-update_archive_file(G_GNUC_UNUSED struct directory *directory,
-		    G_GNUC_UNUSED const char *name,
-		    G_GNUC_UNUSED const char *suffix,
-		    G_GNUC_UNUSED const struct stat *st)
+update_archive_file(gcc_unused struct directory *directory,
+		    gcc_unused const char *name,
+		    gcc_unused const char *suffix,
+		    gcc_unused const struct stat *st)
 {
 	return false;
 }
diff --git a/src/uri.h b/src/uri.h
index 5a9b472f..6713f169 100644
--- a/src/uri.h
+++ b/src/uri.h
@@ -20,7 +20,7 @@
 #ifndef MPD_URI_H
 #define MPD_URI_H
 
-#include <glib.h>
+#include "gcc.h"
 
 #include <stdbool.h>
 
@@ -28,10 +28,10 @@
  * Checks whether the specified URI has a scheme in the form
  * "scheme://".
  */
-G_GNUC_PURE
+gcc_pure
 bool uri_has_scheme(const char *uri);
 
-G_GNUC_PURE
+gcc_pure
 const char *
 uri_get_suffix(const char *uri);
 
@@ -43,7 +43,7 @@ uri_get_suffix(const char *uri);
  * - no double slashes
  * - no path component begins with a dot
  */
-G_GNUC_PURE
+gcc_pure
 bool
 uri_safe_local(const char *uri);
 
@@ -53,7 +53,7 @@ uri_safe_local(const char *uri);
  * NULL if nothing needs to be removed, or if the URI is not
  * recognized.
  */
-G_GNUC_MALLOC
+gcc_malloc
 char *
 uri_remove_auth(const char *uri);
 
diff --git a/src/util/bit_reverse.h b/src/util/bit_reverse.h
index e44693b1..54cb789b 100644
--- a/src/util/bit_reverse.h
+++ b/src/util/bit_reverse.h
@@ -20,12 +20,13 @@
 #ifndef MPD_BIT_REVERSE_H
 #define MPD_BIT_REVERSE_H
 
-#include <glib.h>
+#include "gcc.h"
+
 #include <stdint.h>
 
 extern const uint8_t bit_reverse_table[256];
 
-G_GNUC_CONST
+gcc_const
 static inline uint8_t
 bit_reverse(uint8_t x)
 {